Language: PHP 8 attributes — compliance PHPT pack (#1354 VM v1)

[PurHur]

Problem

#1354 tracks PHP 8 #[...] attributes on classes, methods, properties, and parameters. Wave 3 is 12/13 with only attributes open (#1380, #1751). There is no compliance PHPT proving decorated declarations parse and execute (attributes ignored at runtime per PHP semantics).

Contributors cannot land #1354 incrementally without a green VM slice in ci-fast.sh (#1904 waits on this).

Scope (v1 — VM only)

1. Parse attribute groups on class, method, property, parameter, constant declarations (host php-parser on PHP 8.2+ — Dependencies: php-parser token map for PHP 8.2+ host runs #113)
2. Store metadata on compiler class table (or strip before lowering — document choice)
3. Runtime: ignore attributes for execution (no reflection API in v1)
4. Remove / narrow UnsupportedRegistry entries for decorated declarations
5. Add compliance PHPTs under test/compliance/cases/language/attributes_*.phpt

Out of scope: JIT/AOT attribute reflection, #[\Attribute] validation, enum targets.

Implementation hints

Layer	Files	Notes
Parser	vendor/nikic/php-parser	AttributeGroup, Attribute nodes
Compiler	lib/Compiler.php compileClassLike, compileClassMethod	Attach attrGroups to symbol metadata bag
VM	lib/VM.php	No-op at dispatch
Lint	lib/Lint/UnsupportedRegistry.php	Drop blocks for decorated Class_ / ClassMethod
Tests	test/compliance/cases/language/attribute_class.phpt	#[\AllowDynamicProperties] class runs
Tests	attribute_method.phpt	Method with #[\Deprecated] still callable
CI gate	#1904	ATTRIBUTES_COMPLIANCE_GATE=1 after PHPTs green

Suggested PHPT (minimum)

#[\AllowDynamicProperties]
class Box {
    #[\Deprecated]
    public function ping(): string { return 'pong'; }
}
echo (new Box())->ping();
// EXPECT: pong

Acceptance criteria

./script/ci-fast.sh --filter attribute
vendor/bin/phpunit test/compliance/cases/language/attribute_class.phpt

Docker:

docker run --rm -v "$(pwd):/compiler" -w /compiler php-compiler:22.04-dev \
  ./script/ci-fast.sh --filter attribute

Dependencies

• Language: PHP 8 attributes (#[Attr] on classes, methods, properties) #1354 — parent implementation issue
• CI: Default ATTRIBUTES_COMPLIANCE_GATE=1 in ci-fast after #1354 lands #1904 — default-on ci-fast gate (after this lands)
• Dependencies: php-parser token map for PHP 8.2+ host runs #113 — host parser tokens (parallel)

Links

• Wave 3 tracker Roadmap wave 3: full PHP language + stdlib gaps tracker (#1354–#1379) #1380 · close-out Wave 3 close-out: land remaining language + debug_backtrace (#1380 finish line) #1751
• ROADMAP 🗺️ ROADMAP: Self-host + web-capable PHP subset (living) #78 Phase 1 Language